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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AncestorSubgridIterator.h"
#include "RenderIterator.h"
namespace WebCore {
AncestorSubgridIterator::AncestorSubgridIterator() = default;
AncestorSubgridIterator::AncestorSubgridIterator(SingleThreadWeakPtr<RenderGrid> firstAncestorSubgrid, GridTrackSizingDirection direction)
: m_firstAncestorSubgrid(firstAncestorSubgrid)
, m_direction(direction)
{
ASSERT_IMPLIES(firstAncestorSubgrid, firstAncestorSubgrid->isSubgrid(direction));
}
AncestorSubgridIterator::AncestorSubgridIterator(SingleThreadWeakPtr<RenderGrid> firstAncestorSubgrid, SingleThreadWeakPtr<RenderGrid> currentAncestorSubgrid, GridTrackSizingDirection direction)
: m_firstAncestorSubgrid(firstAncestorSubgrid)
, m_currentAncestorSubgrid(currentAncestorSubgrid)
, m_direction(direction)
{
ASSERT_IMPLIES(firstAncestorSubgrid, firstAncestorSubgrid->isSubgrid(direction));
}
AncestorSubgridIterator::AncestorSubgridIterator(SingleThreadWeakPtr<RenderGrid> firstAncestorSubgrid, SingleThreadWeakPtr<RenderGrid> currentAncestorSubgrid, std::optional<GridTrackSizingDirection> direction)
: m_firstAncestorSubgrid(firstAncestorSubgrid)
, m_currentAncestorSubgrid(currentAncestorSubgrid)
, m_direction(direction)
{
}
AncestorSubgridIterator AncestorSubgridIterator::begin()
{
return AncestorSubgridIterator(m_firstAncestorSubgrid, m_firstAncestorSubgrid, m_direction);
}
AncestorSubgridIterator AncestorSubgridIterator::end()
{
return AncestorSubgridIterator(m_firstAncestorSubgrid, nullptr, m_direction);
}
AncestorSubgridIterator& AncestorSubgridIterator::operator++()
{
ASSERT(m_firstAncestorSubgrid && m_currentAncestorSubgrid && m_direction);
if (m_firstAncestorSubgrid && m_currentAncestorSubgrid && m_direction) {
auto nextAncestor = RenderTraversal::findAncestorOfType<RenderGrid>(*m_currentAncestorSubgrid);
m_currentAncestorSubgrid = (nextAncestor && nextAncestor->isSubgrid(GridLayoutFunctions::flowAwareDirectionForGridItem(*nextAncestor, *m_firstAncestorSubgrid, m_direction.value()))) ? nextAncestor : nullptr;
}
return *this;
}
RenderGrid& AncestorSubgridIterator::operator*()
{
ASSERT(m_currentAncestorSubgrid);
return *m_currentAncestorSubgrid;
}
bool AncestorSubgridIterator::operator==(const AncestorSubgridIterator& other) const
{
return m_currentAncestorSubgrid == other.m_currentAncestorSubgrid && m_firstAncestorSubgrid == other.m_firstAncestorSubgrid && m_direction == other.m_direction;
}
AncestorSubgridIterator ancestorSubgridsOfGridItem(const RenderBox& gridItem, const GridTrackSizingDirection direction)
{
ASSERT(gridItem.parent()->isRenderGrid());
if (const auto* gridItemParent = dynamicDowncast<RenderGrid>(gridItem.parent()); gridItemParent && gridItemParent->isSubgrid(direction))
return AncestorSubgridIterator(gridItemParent, direction);
return AncestorSubgridIterator();
}
} // namespace WebCore
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